fatal error: concurrent map read and map write
DIAGNOSIS:
I0301 00:37:41.702618   48837 main.go:305] ***************************
I0301 00:37:41.702659   48837 main.go:306] Args: [/syzkaller/managers/main/current/image -root /syzkaller/managers/main/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=shared -network=none debug -stacks --ps ci-gvisor-main-3]
I0301 00:37:41.702684   48837 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0301 00:37:41.702701   48837 main.go:308] PID: 48837
I0301 00:37:41.702720   48837 main.go:309] UID: 0, GID: 0
I0301 00:37:41.702736   48837 main.go:310] Configuration:
I0301 00:37:41.702761   48837 main.go:311] 		RootDir: /syzkaller/managers/main/workdir/gvisor_root
I0301 00:37:41.702799   48837 main.go:312] 		Platform: ptrace
I0301 00:37:41.702832   48837 main.go:313] 		FileAccess: shared, overlay: false
I0301 00:37:41.702873   48837 main.go:314] 		Network: none, logging: false
I0301 00:37:41.702899   48837 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0301 00:37:41.702925   48837 main.go:316] ***************************
D0301 00:37:41.702980   48837 container.go:159] Load container "/syzkaller/managers/main/workdir/gvisor_root" "ci-gvisor-main-3"
D0301 00:37:41.704634   48837 container.go:592] Signal container "ci-gvisor-main-3": signal 0
D0301 00:37:41.704667   48837 sandbox.go:806] Signal sandbox "ci-gvisor-main-3"
D0301 00:37:41.704689   48837 sandbox.go:318] Connecting to sandbox "ci-gvisor-main-3"
D0301 00:37:41.704845   48837 urpc.go:534] urpc: successfully marshalled 96 bytes.
I0301 00:37:41.933943   48837 debug.go:122] Found sandbox "ci-gvisor-main-3", PID: 47389
I0301 00:37:41.934042   48837 debug.go:131] Retrieving sandbox stacks
D0301 00:37:41.934072   48837 sandbox.go:924] Stacks sandbox "ci-gvisor-main-3"
D0301 00:37:41.934084   48837 sandbox.go:318] Connecting to sandbox "ci-gvisor-main-3"
W0301 00:37:41.934128   48837 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 47389: connection refused
retrieving stacks: connecting to control server at PID 47389: connection refused
W0301 00:37:41.934351   48837 main.go:338] Failure to execute command, err: 1